I'll give interested and prospective participants alike a little more detail here as to what this will be now that sufficient interest has been shown. I'm not going to get super detailed, because I think it'll be fun to really give your character that 'fish out of water' feel, but a few more details are in order. Consider this kind of your on-boarding. It's info your character will receive shortly after waking up.
Where is Murder City?
Murder City is a solitary environment, which is to say there's no known way out. At the outskirts, around the entire city, the ground ends into a sheer drop into nothingness. The space beyond and below is impenetrable blackness.
Kill to Live
The city is so named because you must kill to survive. The currency is called NG's. It's short for phalanges. Upon waking, you'll eventually realize that an incision has been made on the ring finger of your left hand. Inscribed on the proximal phalange of your left hand is esoteric symbols of unknown significance, and it's the only way for others to survive. Scattered throughout the city are supply boxes, and the only way to open them is with NG's. Once the boxes are opened, the symbols glow bright, and the bone currency is destroyed. So is the box, only to resurface hours later in a new location. Take care not to remove an NG from a living body, though. If the heart is still beating, the symbols glow green, and the body dies and the bone is destroyed with it. So only in death is the NG useful. Murder is necessary, essential. Kill to live. It's the only law of Murder City.
To Be A Murder Simulation or Not to Be...
Just because Murder is a large part of the premise and heavily colors the world (mostly red), does not mean all you're going to do is hack and slay all day long. That's not the point of this RP. The point is that your character is thrust into an insane set of circumstances and must deal with them or die. Murdering is something you'll eventually come across, but it's for flavor and context. This isn't a power fantasy. It's survival in an impossible situation. Let me emphasize something, though. This is not a PvP game. I will not allow PCs to kill each other. You don't have to cooperate, you don't even have to stay in the same place, but no one wants their character to be jacked. That's no fun for anyone.